RFR: 8273147: Update and restructure TestGCLogMessages log message list [v4]

[Thomas Schatzl]

> Hi all,
> 
>   please review this change that updates the TestGCLogMessages file for more or less recently added log messages.
> 
> Test: executing test case
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  Move ext root scan subphases to proper location

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5306/files
  - new: https://git.openjdk.java.net/jdk/pull/5306/files/a8f27ca1..59fccb02

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5306&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5306&range=02-03

  Stats: 11 lines in 1 file changed: 5 ins; 6 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5306.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5306/head:pull/5306

PR: https://git.openjdk.java.net/jdk/pull/5306